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Abstract

We report a photonic frequency discriminator built on the vertically integrated As2S3-ring-on-Ti:LiNbO3 hybrid platform. The discriminator consists of a Mach Zehnder interferometer (MZI) formed by the optical path length difference (OPD) between polarization modes of Ti-diffused waveguide on LiNbO3 substrate and a vertically integrated As2S3 race-track ring resonator on top of the substrate. The figures of merit of the device, enhancement of the signal-to-3rd order intermodulation distortion (IMD3) power ratio and corresponding 3rd order intercept point (IP3) over a traditional MZI, are demonstrated through device characterization.

Figures (9)

(a) Schematic of the linear frequency discriminator and (b) intensity response for bar state of the discriminator with C = 0.87 and ϕ0 = π/2 versus frequency normalized to one FSR of the APF. The nonlinear relative phase between the two arms results in the linear intensity ramp.